Transmission-line device



Filed NOV. 2, 1927 /2 C W K 121- /8 Fig.3. 2

- 4/ 30 I l3 5 3a 35 36 I4 36 35 2/ 22 2 2 25 24 8 32 25 28 INVENTOR 9 4 M75 fih/ah/berg.

/7 j ATTORNEY Patented Dec. 30, 19:30

. UN OSTATESJJFPATENT- C 4 NILS WAHLBERG, F WILKINSBURG,v PENNSYLVANIA, ASSIGNOR T0 WESTING- HOUSE ELEGTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- service for whichit is intended.

VANIA a E TRANSMISSION-LINE DEVICE Application filed November 2,11927. Serial No. 230,459. 7

fMy invention relates to transmissioneline devices and particularly to electrostatic-fieldcontrol structures forhigh-volta'ge insulators. One objectof myinvention is to provi'de a device of the above-indicatedcharacter that shall be adjustableto'adapt it to different structural and electrostatic conditions inthe .Another object of my invention is to provid an electrostatic fiQL TCOIItIfOl shield that shall beprotected against damage by movement of ajtransmission-line conductor in certain service in whichlitmay be employed,

1 shield which may be mounted centrally rela- 'tive to an insulator, while the latter is in operative position relative to a conductor and a supporting tower.

A further object of my. invention is toprovide a transmission-line device that shall be simple and durable in construction, economical to manufacture and effective in' its op- 'eration. Inhigh voltagetransmission-line practice, it has been usual to provide arcingihorns or .rings and electrostatic-field control shields at one or both ends ofthe insulators'which sup port the conductors. These devices' h ave,

' been of-fiXed shapes and sizes and each only adapted for conditions. I

one particular service or set of Also, while arcing rings have I been suggested that may be placed in position around the insulator axis while the insulator is-in operative position between a tower and a conductor without detaching it, it is not known to me that a disk-like shield hasever been so adapted. i

. Further, in certain service recently de- 7 v eloped wherein aclamp normallyholds a conductor securely but permits the conductor to slip therethrough under certain abnormal ture that includes befo're, whereby an which is a quite different structure from 'a ring, has been so adapted. v y

It is my aim,therefore, to vprovide a strucone or all of above mentioned as not having been employed device shall be provided that may be adjusted to various conditions and that may be in the form of a disl r-like shield for mounting about an insulator-"axis, while the insulator is; in

service, and that has a removablesection to the features electrostatic-field-control prevent damage 'thereto by contact with the p 7 conductor; ,Another object ofmy invention is to "provide a disc-like electrostatic-field-control Accordingly, in practicing myinvention, I

provide afield-control structure having relatively adjustable movable parts to vary the field-controlling character andlthat, where employed as a disk-like shield, is so constructed as "to .permitlits, mounting relative to an insulator, in the operative position of the latter, and to prevent damage to the disk by engagement'with the conductor.

Figure 1 of the accompanying drawing is a topplan view of a transmission-line device embodying my invention, 1 Fig. 2 is a'partially takenalong the line' II'-II of Fig. 1, aninsectional side view,

sulator being shown that is not. shown in Fig ,1 and'T however, to the best of my vknowledge, all

Fig. 3lis'l a sectional view taken substantlally along the line III-III of Fig. 2;,

The structure illustrated comprises,in general, an insulator 2, a suspension clamp 3 1for the reception of a transmission-line conductor or cable 4 and an electrostatic-field-control device 50f my invention.

The insulator 2 is vone of ausual seriesstring suspension type for connection, at its upper end, tov a: pole, tower or other main support (not shown) and needs no further description, so far' as 'my invention is concerned, except that it may swing, from left to right,.yfromits normal. position shown, about its point of suspension on thetower;

' The clamp 3 maybe of any usual typebut,

asshown, is of a typeset forth in my copending application, Serial No. 209,441, filed July 80, 1927, and not specificallypertinent to my. present invention beyond the fact that,

18, and a. central projection 19 on the yoke.

that cooperates with the cam 9 to release the latter, when the channel member 3 and the yoke 14 are moved angularly relative to each other about the trunnions 15.

' The elect-rostatic-field-control device comprises substantially parallel elongated supporting members 21 of L-shape in cross-section having vertical side legs 22 secured to lugs 23 on the yoke 14, by screws 24, and oppositely-projecting horizontal upper legs Half-shield members 27 and 28, which together constitute a general structure of die]; like character having Widely rounded or tubelike outer perimetral edges 29 and upturned perimetral portions or ends 30, are preferably constructed of relatively thin sheet metal having overlapping telescopically related adjacent or intermediate portions 32 and 33, respectively.

The portion 33, which is above the portion 32, is provided with elongated slots 35, extending parallel to the conductor 4, through which screws 36 extend into the arms of the supporting members 21. a central inner portion being cut-away to permit the portion to enclose three sides of the yoke 14.

Similarly, the portion 32, which isfitted under, or into the inner portion of, the half portion 33, is provided with slots 38' through which screws 39 extend into the arms 25 of the supporting members 21, a portion being cut-away so that it encloses threesides of the yoke 14, including a side which is not embraced by the portion 33.

In operation, the structure, as above described, permits the halves 27 and 28 of the field-control structure 5 to be telescopically fitted to each other about the of the insulator 2, while the latter is mounted in opcrative position between the tower and the clamp 3, withoutdetaching the insulator from either the tower or the clamp, as where a one-piecc shield or other annular member is employed.

By manipulation of the screws 86 and 39, and by moving the halves 27 and 28 along a diameter substantially parallel to, and above, the conductor 4, the area of the shield presented to the lield above the clamp may be varied, within certain limits, and fixed in adjusted position. This feature and the upturned ends are to adapt the shield to different conditions of service and to compensate for the effects of the conductor 4 and of other parts, which may vary in character, on the electrostatic field of the insulator.

The half portions 27 and 28 of the shield 5 may be provided, at the ends thereof, with sections 40 and 41 which are pivotally mounted, as by hinges 43 and. 44, respectively, to the main bodies of the halves 27 and 28, and which normally lie flush with the adjacent surfaces of the shield. When, by reason of breaking of the conductor 4 between its main supports, the structure illustrated swings a certain distance to the right or to the left, as viewed in the drawing, about its tower support at the upper end of the structure, the channel member 3 and the yoke 14 move angularly relative to each other. This movement causes the projection 19 on the yoke 14 to actuate the cam 9 to release the conductor.

Also, during the above-movement, the conductor 4 and the shield 5 tend to come to' gether violently at one end of the shield, which might ordinarily damage the shield and render it unfit for further service. However, in my structure, such damage is prevented by reason of the fact that the sections 40 and 41 move with the conductor and are automatically restored to normal position when normal line conditions are restored.

By my invention, a structure is provided that is of ready and economical manufacture, is easy to install, adapts itself to insulators, clamps and main supports of various types and sizes, has the other advantages above mentioned, and is, in general, an improvement in the art to which it relates.

While I have shown and described a particular form of my invention, changes may be effected therein without departing from the spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. In a transmission-line device, the combination with an insulator, of an electrostatic-field-control structure including a portion for mounting the structure relative to the insulator and an extensible field-control element surrounding the insulator axis on said portion.

2. In a transmission-line device, the combination with an insulator, of an electrostatic-field-control structure including a por tion for mounting the structure relative to the insulator and a field-control element adjustably mounted on said portion for varying the field-controlling operation of the structure and having a section relatively movable in response to certain movements of the line.

3. In a transmission-line device, the combination with an insulator, of an electrolot) static-field-control shield structure therefor including aportion for mountingthe shield relative to the insulator and half-shield portions mounted thereon for relatively movable adjustment along a diameter of the shield.

4. In a transmission-line device, the combination with an insulator, of an electro static-field-control shield structure therefor including a'portion for mounting the shield relative to the insulator and half-shield por tions mounted thereon for relatively movable adjustment along a diameter of the shield, said half-portions having substantially telescopically related tube-like perimetraledges.

5. In a transmission-line static-field-control shield structure therefor including a portion for mounting the shield relative to the insulator and half-shield portions mounted thereon for relatively movable adjustment along a diameter of the shield, said halfportions having registeringslots, and means in said slots cooperating with said mounting portion;

6. In a transmissiondine device, the combination with an insulator, of an electrostatic-field-control shield of substantially disklike character including a section relatively movable to the remainder thereof in response tocertain movements of the line.

7. In a transmission-line device, the combination with an insulator disposed between a line conductor and a main supporting structure, of a disk-like electrostatic-field-control shield mounted normal to the axis of the insulator and including portions whereby the shield may be mounted and dismounted rel ative to the insulator while the latter is in operative position relative to said andsald structure.

.8. In a transmlssion-line device, the combinationwith an insulator, of an electroconductor static-field-control structure including'aportion for mounting the structure relative to y the insulator and anextensible field-control disk-like shield disposed centrally,and ex- ;tending laterally, relative to the insulator.

, 9. In a transmission-line device, the combination With an insulator, of an electrov static field-control structure therefor including a portion for mounting the structure the shield.

.relative to the insulator and a disk-like shield 5 element having relatively adjustable portions for varying the field-control surfaceof In testimony whereof, I have hereunto subscri ped my name this 26th day of October, 192 r i V NILS A. WAHLBEBGQ device, the combination with aninsulator, of anelectro- 

